Deleted - sorry, this really was a bit pointless about something so small. Idle curiosity really given I've been studying nerve cell signalling and potassium so it was just thinking out loud in an attempt to avoid actually doing some work. It really doesn't bother me, I am not anxious about it in the slightest, I just find it vaguely interesting.
However this is probably the kind of thing GrannyMo was talking about as it sounds like I'm obsessing even though I am not really concerned that this is somehow remotely significant - I just get interested in muscles etc. So really sorry for randomly sharing, I should probably just stick to Wikipedia-surfing lol to satisfy my curiosity as this is not really what AUK is for.